|A quick look at iobit shows it to be package of PC utilities to "speed up, security items, clean out, and other stuff..."|
Do you really need it? Frequently such packages seem to produce assorted problems of their own, and then "usually"/often require you to purchase more stuff to resolve them
If the programmes that won't install etc. are all related to iobit, then I suggest you get rid of iobit completely. Thee are other free stand alone utilities, frequently recommended here at CN, and all found to be trouble free.